<!DOCTYPE html>
<html>
<body>
<?php
echo substr_compare("world","or",1,2)."<br>";
echo substr_compare("world","ld",-2,2)."<br>";
echo substr_compare("world","orl",1,2)."<br>";
echo substr_compare("world","OR",1,2,TRUE)."<br>";
echo substr_compare("world","or",1,3)."<br>";
echo substr_compare("world","rl",1,2)."<br>";
?>
</body>
</html>